Module v4 

MQTT v3.1.1 Implementation

Implementation of MQTT 3.1.1 (OASIS Standard, most widely deployed version).

Differences from v3.1

• Enhanced error handling with specific return codes
• Improved session management with persistent sessions
• Standardized protocol name and version identification
• Clarified specification semantics and edge cases

Structs

ConnAck

Represents an MQTT ConnAck packet.

Connect

Represents an MQTT Connect packet

Disconnect

Represents an MQTT Disconnect packet.

PingReq

Represents an MQTT PingReq packet.

PingResp

Represents an MQTT PingResp packet.

PubAck

Represents the packet ID PubAck packet

PubComp

Represents the packet ID PubComp packet

PubRec

Represents the packet ID PubRec packet

PubRel

Represents the packet ID PubRel packet

Publish

Represents an MQTT Publish packet.

SubAck

The SubAck packet is sent by the server to the client to confirm receipt and processing of a subscription request. It contains return codes indicating the maximum QoS level granted for each requested subscription.

Subscribe

Represents an MQTT Subscribe packet.

TopicQosFilter

Represents a single topic filter and its requested QoS level.

TopicQosFilters

Represents a collection of TopicQosFilter instances.

UnsubAck

Represents the packet ID UnsubAck packet

Unsubscribe

Represents an MQTT Unsubscribe packet.

Will

Represents the Last Will and Testament (LWT) feature in MQTT.

Enums

ConnectReturnCode

Represents the return codes for a connection attempt in the MQTT protocol.

Packet

Represents all possible MQTT v3.x packet types

ReturnCode

Represents the return codes for a SubAck packet.